at its simplest is a representation of a user's interaction with the system and depicting the specifications of a use case. A use case diagram can portray the different types of users of a system and the various ways that they interact with the system. This type of diagram is typically used in conjunction with the textual use case and will often be accompanied by other types of diagrams as well.
the purposes of use case diagrams can be as follows:
Used to gather requirements of a system.
Used to get an outside view of a system.
Identify external and internal factors influencing the system.
Show the interacting among the requirements are actors.
How to draw Use Case Diagram?
Functionalities to be represented as an use case
Actors
Relationships among the use cases and actors.
Use case diagrams are drawn to capture the functional requirements of a system. So after identifying the above items we have to follow the following guidelines to draw an efficient use case diagram.
The name of a use case is very important. So the name should be chosen in such a way so that it can identify the functionalities performed.
Give a suitable name for actors.
Show relationships and dependencies clearly in the diagram.
Do not try to include all types of relationships. Because the main purpose of the diagram is to identify requirements.
Use note when ever required to clarify some important points.
A use case diagram
at its simplest is a representation of a user's interaction with the system and depicting the specifications of a use case. A use case diagram can portray the different types of users of a system and the various ways that they interact with the system. This type of diagram is typically used in conjunction with the textual use case and will often be accompanied by other types of diagrams as well.the purposes of use case diagrams can be as follows:
Used to gather requirements of a system.
Used to get an outside view of a system.
Identify external and internal factors influencing the system.
Show the interacting among the requirements are actors.
How to draw Use Case Diagram?
Functionalities to be represented as an use case
Actors
Relationships among the use cases and actors.
Use case diagrams are drawn to capture the functional requirements of a system. So after identifying the above items we have to follow the following guidelines to draw an efficient use case diagram.
The name of a use case is very important. So the name should be chosen in such a way so that it can identify the functionalities performed.
Give a suitable name for actors.
Show relationships and dependencies clearly in the diagram.
Do not try to include all types of relationships. Because the main purpose of the diagram is to identify requirements.
Use note when ever required to clarify some important points.